mx28: pull up GPIO pin seems failed

hwo — Sun, 24 Jan 2016 10:55:04 GMT

Hi all,

I come across a problem. I initialize the AUART2.RTS pin(Bank 3, ID 11), and enable it to be a output GPIO pin. At the same time, enable the pull up function. But when I read out the HW_PINCTRL_PULL3 register. I get all 0. The settings in others register like MUX, DOUT, DRIVE and DOE are quite normal. I haven't modified the pinctrl.c file. It's original.

Why this happens?

{

.name = "AUART2.RTS",

.id = PINID_AUART2_RTS,

.fun = PIN_GPIO,

.strength = PAD_4MA,

.voltage = PAD_3_3V,

.drive = 1,

.pullup = 1,

.pull = 1,

.output = 1,

.data = 0,

One more question, does the pull up function affect the GPIO's output? According to the MX28RM, it only disable the gate keeper.

Thanks in advance.

Re: mx28: pull up GPIO pin seems failed

igorpadykov — Mon, 25 Jan 2016 01:41:34 GMT

Hi h k

pull up function does not affect the GPIO's output, however

not all pads have pul-ups, only described in

Table 9-3. i.MX28 Functions with Pullup Resistors MX28RM

http://cache.freescale.com/files/dsp/doc/ref_manual/MCIMX28RM.pdf

Best regards

igor

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mx28: pull up GPIO pin seems failed

Re: mx28: pull up GPIO pin seems failed